ipv4.las.uz has no CNAME records.
Question and response
Question
dig ipv4.las.uz. NS
Answer
The response has no answer records.
Authority
las.uz. 10603 SOA ns01.uzsci.net. davronaka.yahoo.com. 1770677039 10800 3600 604800 10800
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0